DHCPv6 Option 56 configuration

[Marek Hajduczenia]

You're spot on, Milo - the part of dhcp6 being the option space was missing. In hindsight, it is pretty obvious now that I see that working fine. Not sure if the images / attachments get stripped by the mailing list but the outcome is as expected – I now have Option 56 showing up in the server response. Pretty neat. 

 

I wish this part of having to use dhcp6 as the option space was documented in manpage somewhere. I would have saved a few days of searching and experimenting and getting frustrated

 



 

Much appreciated!

 

M

 

-----Original Message-----
From: dhcp-users <dhcp-users-bounces at lists.isc.org> On Behalf Of Miloslav Hula
Sent: Friday, January 19, 2024 12:25 AM
To: dhcp-users at lists.isc.org
Subject: Re: DHCPv6 Option 56 configuration

 

Dne 19.01.2024 v 0:27  <mailto:mxhajduczenia at gmail.com> mxhajduczenia at gmail.com napsal(a):

> Just to build some more in here …

> 

> I tried to create a fake option 56 using the following config

> 

> /option dhcp6.ntp-servers code 56 = text;/ /option dhcp6.ntp-servers 

> "This is a test";/

> 

> and it does causes Option 56 to show up, but obviously, it is 

> malformed, as expected.

> 

> Then I go with a proper definition of Option 56 as an encapsulation 

> option as shown below

> 

> /option space ntp56 code width 2 length width 2 hash size 2;/ /option 

> ntp56.address code 1 = array of ip6-address;/ /option ntp56.fqdn code 

> 3 = text;/ /option opt56 code 56 = encapsulate ntp56;/ /option 

> ntp56.address ::1;/ /vendor-option-space ntp56;/

 

Oh, I'm sorry. The sntp-servers is option 31.

 

I think vendor-option-space is not necessary. It is for custom vendor options e.g. if one vendor use option code 10 and other vendor use the option code 10 too but with different meaning. I would try:

 

option space ntp56 code width 2 length width 2 hash size 2; option ntp56.address code 1 = array of ip6-address; option ntp56.fqdn code 3 = text; option dhcp6.ntp-servers code 56 = encapsulate ntp56;

 

ntp56.address = fc00:6ce4:40:146::1;

ntp56.fqdn = "ntp.example.com";

 

 

Would like to test, but none of our of thousands clients does not require this option.

 

Milo

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